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Stratigraphy and Origin of the Paha Topography of Northwestern Illinois

Published online by Cambridge University Press:  20 January 2017

Ronald C. Flemal ,
I. Edgar Odom  and
Ronald G. Vail
Ronald C. Flemal
Affiliation:
Department of Geology, Northern Illinois University, De Kalb, Illinois 60115 USA
I. Edgar Odom
Affiliation:
Department of Geology, Northern Illinois University, De Kalb, Illinois 60115 USA
Ronald G. Vail
Affiliation:
Erie High School, Erie, Illinois 61250 USA
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Abstract

The paha of northwestern Illinois are longitudinal dunes developed in toto during Woodfordian time. Cores of noneolian materials, such as are typical in the paha of northeastern Iowa, are either not present or much reduced in numbers in the paha of Illinois. Variation in the thickness of the surface blanket of Peoria Loess accounts for the total topographic expression of the Illinois paha.

Underlying the Peoria Loess is a sequence of Pleistocene deposits consisting of two tills of Illinoian age, and the Plano Silt and Roxana Loess of Altonian age. Radiocarbon ages obtained from the Plano Silt range from 41,900 ± 1300 to 34,630 ± 710 radiocarbon years B.P.

Type
Original Articles
Information
Quaternary Research , Volume 2 , Issue 2 , September 1972 , pp. 232 - 243
Copyright
Academic Press, Inc.

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